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- Collecting Syslog
- Collection by LogListener
- Collecting Text Log
- Uploading Log over Kafka
- Uploading Logs via Anonymous Write
- Uploading Logs via Logback Appender
- Uploading Logs via Log4j Appender
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- Log Storage
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- Statistical Analysis (SQL)
- Quick Analysis
- SQL Syntax
- SQL Functions
- String Function
- Date and Time Functions
- IP Geographic Function
- URL Function
- Mathematical Calculation Functions
- Mathematical Statistical Function
- General Aggregate Function
- Geospatial Function
- Binary String Function
- Estimation Function
- Type Conversion Function
- Logical Function
- Operators
- Bitwise Operation
- Regular Expression Function
- Lambda Function
- Conditional Expressions
- Array Functions
- Interval-Valued Comparison and Periodicity-Valued Comparison Functions
- JSON Functions
- Window Functions
- Sampling Analysis
- Configuring Indexes
- Reindexing
- Context Search and Analysis
- Downloading Log
- Dashboard
- Data Processing documents
- Data Processing
- Creating Processing Task
- Viewing Data Processing Details
- Data Processing Functions
- Function Overview
- Key-Value Extraction Functions
- Enrichment Functions
- Flow Control
- Row Processing Functions
- Field Processing Functions
- Value Structuring Functions
- Regular Expression Processing Functions
- Time Value Processing Functions
- String Processing Functions
- Type Conversion Functions
- Logical and Mathematical Functions
- Encoding and Decoding Functions
- IP Parsing Functions
- Processing Cases
- Scheduled SQL Analysis
- SCF
- Data Processing
- Shipping and Consumption
- Monitoring Alarm
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- API Documentation
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Aggregate Function
Last updated: 2024-01-22 10:52:48
An aggregate function performs calculations on a set of values and returns a single value. It is often used in combination with the GROUP BY clause in the SELECT statement.
Statement | Description | Example | Sample SQL |
AVG(KEY) | Calculates the arithmetic average of the KEY column. | Calculates the average response time of requests. | * | SELECT AVG(request_time) |
COUNT(*) | Indicates the number of all rows. | Calculates the number of all requests with a status code greater than 200. | * | SELECT COUNT(*) WHERE http_status > 200 |
COUNT(KEY) | Counts the number of non-null rows in the KEY column. | Calculates the number of requests with a request time greater than 5.0 seconds. | * | SELECT COUNT(request_time) WHERE request_time > 5.0 |
COUNT(1) | Indicates the number of all rows (equivalent to COUNT(*)). | - | - |
COUNT(DISTINCT(KEY)) | Counts the number of deduplicated rows in the KEY column. | Calculates the number of unique client IPs (UV). | * | SELECT COUNT(DISTINCT(remote_addr)) AS UV |
MAX(KEY) | Returns the maximum value of the KEY column. | Calculates the maximum request time. | * | SELECT MAX(request_time) AS max_request_time |
MIN(KEY) | Returns the minimum value of the KEY column. | Calculates the maximum request time. | * | SELECT MIN(request_time) AS min_request_time |
SUM(KEY) | Returns the sum of the KEY column. | Calculates the total number of requested bytes. | * | SELECT SUM(body_bytes_sent) AS sum_bytes |
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